JPH066230U - Paper container - Google Patents

Abstract

(57) [Summary] [Purpose] It is intended to provide a paper container which has a low moisture permeability, does not limit the contents, and has a good incineration property. [Structure] A laminated body of paper and high-density polyethylene or biaxially oriented polypropylene is used as a base material, and a resin layer is laminated on both surfaces of the base material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper container that stores and holds a liquid.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, a paper container for storing and holding a liquid such as milk and a soft drink has been known, and a material which is water-impermeable by laminating a resin film or the like on paper is used. For example, when the content is milk or soft drinks, a material in which both the front and back sides of the paper are covered and laminated with low density polyethylene film is used, and when it is sake or orange juice, an aluminum sheet is further laminated and the content is It improves the protection of things.

However, the material in which paper and a low-density polyethylene film are laminated has a drawback that the content that can be stored is limited because it has good incineration property but has moisture permeability. On the other hand, the material with laminated aluminum sheets has the advantage of low water permeability, but when incinerating used containers, the aluminum sheet does not burn even if it is thin, which damages the incinerator. was there.

[0004]

[Problems to be solved by the device]

 This invention intends to provide a paper container which has a low moisture permeability, does not limit the contents, and has a good incineration property.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the means adopted by the present invention comprises a material in which a laminate of paper and high-density polyethylene or biaxially oriented polypropylene is used as a base material, and resin layers are laminated on both sides of the base material. It is characterized by

[0006]

[Operation and effect of this device]

 According to this invention, a paper container is made of a material in which a laminate of paper and high-density polyethylene or biaxially oriented polypropylene is used as a base material, and resin layers are laminated on both sides of the base material. In addition to being easily incinerated, it also has high moisture permeation resistance and improves the protection of the contents.

[0007]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a paper container according to the present invention, which is formed into a milk pack for storing and holding milk. However, the present invention is not limited to such milk packs, and it is possible to use milk, soft drinks, alcohol, juice, shampoo, rinse, hair soaps such as liquid soap, detergents, cosmetics, and the like. The liquid can be stored without limitation, and the shape, structure, or pouring means should be appropriately selected and adopted according to the contents to be stored.

As shown in FIG. 2, the paper container according to the present invention comprises a paper (1) and a film (2) of high density polyethylene or biaxially oriented polypropylene laminated on one surface of the paper (1). The material is characterized in that both the front and back surfaces of this base material are coated and laminated with resin films (3) and (4).

The resin film (3) (4) for coating and laminating both sides of the substrate is preferably a film of low density polyethylene, polyethylene terephthalate, linear low density polyethylene, Surlyn resin, or the like. It is not limited. Further, the paper (1) and the film (2) of high density polyethylene or biaxially oriented polypropylene may have any structure in which the inside and the outside are reversed as shown in FIGS. The high density polyethylene or biaxially oriented polypropylene film (2) preferably has a thickness of 20 μm or more. Further, when the resin films (3) and (4) for coating the base material are low density polyethylene film, it is preferable that the resin film has a thickness of 20 μm or more. The high density polyethylene preferably has a density of 0.935 grams per cubic centimeter or greater.

The paper container of the present invention is based on a laminate of the above-mentioned paper (1), high-density polyethylene or biaxially oriented polypropylene film (2) and resin films (3) and (4). Another resin film may be further laminated between any or all of the layers (1), (2), (3) or (4). Further, the base material or the resin layer formed on both sides of the base material or the resin layer interposed in at least one of the respective layers does not necessarily have to be laminated in the form of a film, and may be laminated by an extrusion laminating method. Is also good.

FIG. 4 shows another modification of the paper container according to the present invention, in which a low density polyethylene film (5) is inserted between the paper (1) and the high density polyethylene film (2). Using the body as a base material, further laminating a low density polyethylene film (6) on the outside of the base material, and bonding the first polyethylene terephthalate film (7) on the inside of the base material with an adhesive (8), Further, a second polyethylene terephthalate film (9) is bonded to the inner side of the second polyethylene terephthalate film (9) via an adhesive (10). The high-density polyethylene film (2) and the low-density polyethylene films (5) and (6) have a thickness of 20μ, the first polyethylene terephthalate film has a thickness of 12μ, and the second polyethylene terephthalate film has a thickness of 60μ. Further, as in the case shown in FIGS. 2 and 3, biaxially oriented polypropylene may be used in place of the high density polyethylene, and it may be laminated by an extrusion laminating method.

In this specification, the terms inside and outside have the same meanings as inside and outside of the container when formed in the container.

The paper container of the present invention is not laminated with an aluminum sheet and is composed only of a paper and a resin layer, so that it can be easily incinerated after use and is water resistant. The minute permeability is high and the protection performance of the contents is improved. A conventional paper container made of low-density polyethylene film and paper and a paper container made of the material shown in FIG. 4 according to the present invention were filled with 700 ml of shampoo and left for one month at room temperature to reduce the amount of water loss. As a result of the measurement, the conventional container showed a decrease in water content of 25.2 g, whereas the container of the present invention showed a decrease in water content of only 1.8 g, which is more than 8 times more resistant to water permeation. Was. In addition, the properties of shampoo also changed with the decrease of water in the conventional container, but the properties of the container of the present invention were not changed.

[Brief description of drawings]

 Fig. 1 Perspective view of a paper container according to the present invention Fig. 2 Sectional view of material Fig. 3 Sectional view of material Fig. 4 Sectional view of material according to one modification

[Explanation of symbols]

(1) Paper (2) High-density polyethylene or biaxially oriented polypropylene film (3) Resin film (4) Resin film (5) Low-density polyethylene film (6) Low-density polyethylene film (7) First polyethylene terephthalate film (8) Adhesive (9) Second polyethylene terephthalate film (10) Adhesive

Claims (6)

[Scope of utility model registration request] 1. A paper container characterized by using a laminated body of paper and high-density polyethylene or biaxially oriented polypropylene as a base material, and laminating a resin layer on both surfaces of the base material. 2. A resin layer is further interposed between at least one layer of paper, a layer of high-density polyethylene or biaxially oriented polypropylene, and a resin layer.
The paper container described in (1). 3. The paper container according to claim 1, wherein the layer of high-density polyethylene or biaxially oriented polypropylene has a thickness of at least 20 μm. 4. A base material is a laminate of high-density polyethylene or biaxially oriented polypropylene and paper in which low-density polyethylene is interposed, and low-density polyethylene is laminated on the outside of the base material, and the inside of the base material is laminated. A paper container comprising a material in which two layers of polyethylene terephthalate having different thicknesses are bonded to each other. 5. A low density and high density polyethylene or biaxially oriented polypropylene layer having a thickness of 20 μ and an innermost polyethylene terephthalate layer having a thickness of 60 μ.
5. The paper container according to claim 4, wherein the polyethylene terephthalate layer located on the outer side has a thickness of 12 μm. 6. The paper container according to any one of claims 1 to 5, wherein the high-density polyethylene has a density of 0.935 g per cubic centimeter or more.